Alps:

Located in south-central Europe, they extend for almost 700 miles from the coastline of southern France (near Monaco) into Switzerland, northern Italy and Austria, then southeast through Slovenia, Croatia, Bosnia and Herzegovina as the (Dinaric Alps). They end in Albania on the rugged coastline of the Adriatic Sea.

Known for stunning scenery, glaciers, lakes and valleys and the best skiing conditions on the planet, they're the source of many rivers and tributaries including the Danube, Po, Rhine and Rhone.

Apennines:

The source of almost all rivers in Italy including the Arno, Tiber, and Volturno, the Apennines Mountains (Ital. Appennino) 830 miles (1,350 km) in length, form the backbone of the country, and run the entire length of the Italian Peninsula, ending on the island of Sicily.

Atlantic Highlands:

Formed million of years ago during the Caledonian mountain-building periods as western lands were (forced) or pushed against the Scandinavian Shield. Significant mountain ranges here include the Kjolen in Norway and Sweden, and the Pennines that stretch through the central United Kingdom.